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比较情态动词“have to”与“must” |
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来源： 更新时间：2008年03月10日 情态动词“have to”和“must”都表示 “必须”的意思，但是有 不同的地方。 1． must 主要表示个人的意志，强调主观。例如：You must go home now.
have to 比 must 更通俗，强调客观，含“ 不得不”的意思。
如：It’s raining outside. The children have to stay at home.
2. must 没有人称的变化，而have to有，它的第三人称单数为
“has to”
如：He must finish his homework on Sunday.
He is ill, so he has to see a doctor .
3. must在一般疑问句中直接将它提前大写，在否定句中直接在后边加
not即可。
然而have to 比must有更多的时态，而且“have to”要加助动词
do , does或did才可能完成其疑问、否定句。
如：
1) Do they have to go to the party ? Yes , they do .
2) Does he have to go to see the doctor ? Yes , he does .
3) We don’t have to go to the party.
4) She doesn’t have to have a piano lesson .
（用了助动词 “does”或 “did”表示疑问，否定时一定注意原来动词的第三人称单数或过去式要还原）
明白了吗？让我们来学以致用吧。请选择 must或 have to 填空。
1. A: Let’s see a film tonight.
B: Sorry, I _________ do my homework .
2. It’s 7:35. You _________ be quick , or else you will be late for school.
3. It’s raining outside. I _________ to stay at home .
4. We _________ obey the rules. ( 遵守规则 )
5．Does Amy _________ see a doctor? No, she doesn’t. |
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